Table 5 Bivariate and multivariable logistic regression (final model) analysis result for significant variables (p ≤ 0.25) in bivariate analysis in Mekelle City Public Hospitals, North Ethiopia, 2015

Monthly income

< 1000

1

1

1001–2000

0.44(0.18,1.07)

0.37(0.13, 1.05)

2001–3000

0.77(0.33, 1.80)

0.57(0.21, 1.53)

> 3000

0.63(0.30, 1.32)

0.63(0.26, 1.52)

Carrying heavy objects

No

1

1

Yes

1.99(1.10, 3.62)^a

1.63(0.81, 3.30)

Sleep < 8

No

1

1

Yes

1.62(0.89, 2.97)

1.25(0.59, 2.64)

Abortion

No

1

1

Yes

3.82(1.91, 7.62)^a

3.06 (1.39, 6.71)^a

Previous PROM

No

1

1

Yes

7.64(3.47, 16.8)^a

4.45 (1.87, 10.6)^a

CS

No

1

1

Yes

4.24(1.62, 11.1)^a

3.15(1.05, 9.46)^a

Abnormal Vaginal discharge

No

1

1

Yes

5.13(2.78, 9.47)^a

3.31(1.67, 6.56)^a

Chronic cough

No

1

1

Yes

1.42(0.80, 2.53)

0.75(0.36, 1.56)

Third trimester sexual intercourse

No

1

1

Yes

1.43(0.83, 2.47)

1.44(0.75, 2.76)

Alcohol Intake

No

1

1

Yes

2.42(1.27, 4.63) ^a

1.93(0.91, 4.08)

History of accident

No

1

1

Yes

4.33(1.26,14.8) ^a

2.27(0.69, 7.40)

Gravidity

1

1

1

1–4

1.88(1.01, 3.51) ^a

1.80(0.30,10.6)

> 5

2.17(0.86, 5.48)

2.76(0.20, 36.8)

Parity

0

1

1

1

1.48(0.77, 2.82)

0.66(0.29, 1.48)

2–4

1.60(0.78,3.28)

0.50(0.19, 1.32)

> 5

1.30(0.40, 4.18)

0.29(0.06, 1.45)